Four-byte autonomous system numbers (ASNs) can be configured for a neighbor or peer-group. The following task enables 4-byte autonomous system number (ASN) capability for a BGP4+ neighbor.
Procedure
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Enter the
configure terminal command to access global configuration mode.
device# configure terminal
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Enter the
router bgp command to enable BGP routing.
device(config)# router bgp
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Enter the
local-as command to configure the autonomous system number (ASN) in which your device resides.
device(config-bgp-router)# local-as 1000
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Enter the
neighbor capability as4 command with the
enable parameter, and specify an IPv6 address, to enable 4-byte autonomous system number (ASN) capability for a specific neighbor.
device(config-bgp-router)# neighbor 2001:db8:93e8:cc00::1 capability as4 enable
Example
The following example enables 4-byte autonomous system number (ASN) capability for a specific BGP4+ neighbor.
device# configure terminal
device(config)# router bgp
device(config-bgp-router)# local-as 1000
device(config-bgp-router)# neighbor 2001:db8:93e8:cc00::1 capability as4 enable
